Exclusive electroproduction of K + Λ and K + Σ 0 final states at Q 2 = 0.030–0.055 (GeV/c) 2
European Physical Journal A(2012)
摘要
Cross-section measurements of the exclusive p ( e , e′K + ) Λ, Σ 0 electroproduction reactions have been performed at the Mainz Microtron MAMI in the A1 spectrometer facility using for the first time the KAOS spectrometer for kaon detection. These processes were studied in a kinematical region not covered by any previous experiment. The nucleon was probed in its third-resonance region with virtual photons of low four-momenta, Q 2 = 0.030–0.055 (GeV/c) 2 . The MAMI data indicate a smooth transition in Q 2 from photoproduction to electroproduction cross-sections. Comparison with predictions of effective Lagrangian models based on the isobar approach reveal that strong longitudinal couplings of the virtual photon to the N * resonances can be excluded from these models. Modern isobar and Regge-plus-resonance models are in agreement with the data.
更多查看译文
关键词
Virtual Photon,Nucleon Resonance,Coincidence Time,Photoproduction Data,Longitudinal Coupling
AI 理解论文
溯源树
样例
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要